Fitbit Aria Air stopped syncing once second used been added

[paganelle76]

I really enjoy Fitbit fitness trackers but as much I enjoy Fitbit wearable I don't like scales. I have troubles in the past with Fitbit Aria, but I bought it used so I decided to give another try and got brand new Aria Air  from Amazon.

I connected scales to my Fitbit account pretty easily and got couple of readings, but since my wife also has Fitbit smartwatch we, of course, wanted to to connect her account as well.

First red flag was invite: we tried to open an email invite from the phone but got an error. So after checking the Fitbit forum we opened the invite on the PC and included 2nd user. But right after we both were never been able to get a weight readings.We rebooted phones, took off batteries from the scale - no result. And that was a bummer!

Just to make sure the issue is consistent we both removed the scale from our accounts, reset the scale and now my wife connected it and got couple of readings. Bit once I become the 2nd user - neither she nor me do not get any new readings.

I'll keep the scale for a week or two to give Fitbit a chance to help me, otherwise Aria Air will go back to Amazon with negative review.

[fit_bit_user001]

I had a similar challenge but with the original Aria 1 (four AA batteries)

I am reviewing updating mine due to what I see as a legacy challenge.

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Had the Fitbit Aria 1 for quite a while, and recently it was not showing recent weigh-in.     The app on the phone did show it was syncing, but there was no data.
To resolve, I tried a few things:
1) Uninstall and reinstall the FitBit app on my latest phone  [No luck]

2a) Use the FitBit Aria setup on the phone.  [Remove battery for 10 sec.  Would not progress beyond the setup screen]

2b)  Also did the paperclip and factory reset.  [Would not progress beyond the setup screen]

3) Used the FitBit Aria setup on a computer with wifi.  [Would progress beyond the setup screen, but no complete.]

4)  Use the FitBit Aria setup on older phone with older phone browser (Kiki Browser),  [Success]

While I was troubleshooting #3 step, I could see that the Aria Scale is using an older web server on TCP 80 (HTTP)
-  I noticed that it was sending over "fpc" cookies that were marked as "secure"   [fpc=first party cookie]
- Modern browsers will not allow (enforced security) for sending "secure cookies" over an unsecure channel (aka TCP 80 / HTTP).
- Trying to bypass this challenge is a pain.   You can setup your Chrome browse or other to accept the cookie but this will be a ongoing issue.   The Aria scale does not use HTTPS protocol for its internal web server.

Resolution:

The older browser on my older phone did allow usage of this "fpc" cookie, and I had no other issues when using the latest Fitbit app.

I can now see the recent weightings in the Fitbit app.
Example of the error seen when using a browser (F12 developer view) to access the FitBit Aria (v1) scale.

When the Aria scale wifi was enabled, a port scan showed only TCP 80 open.